Carbs

06-20-2007, 08:17 PM

At the Chicago Allstar race I found several Holley carbs with 4 corner idle adjustment. I pointed this out to Danny Gracia. He said that 4 corner idle adjustment was not allowed in Stock/SS unless it came that way from the factory. It is allowed on Modified type cars in SS. The racers changed their carbs and the race went on.

The 2007 NHRA rulebook in Stock on page 54 under CARBURETOR states the following: "Drilling idle holes in primary throttle blades permitted."

This rule was written to help idle problems on engines with large duration camshafts.

Disclaimer: Opinions expressed by me on this forum are exactly that, my opinions.

06-20-2007, 08:17 PM	#12
Travis Miller Guest Posts: n/a	At the Chicago Allstar race I found several Holley carbs with 4 corner idle adjustment. I pointed this out to Danny Gracia. He said that 4 corner idle adjustment was not allowed in Stock/SS unless it came that way from the factory. It is allowed on Modified type cars in SS. The racers changed their carbs and the race went on. The 2007 NHRA rulebook in Stock on page 54 under CARBURETOR states the following: "Drilling idle holes in primary throttle blades permitted." This rule was written to help idle problems on engines with large duration camshafts. Disclaimer: Opinions expressed by me on this forum are exactly that, my opinions.